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GSfBS Doctoral Representatives

On October 7th, 2020, Michael Bell, Sarah Buchholz and Konstantin Weiss were elected as GSfBS doctoral candidates representatives. Kim Jasmin Lapacz, Lea Hördemann and Moritz Haustein were elected as deputy representatives.
We are herewith members of the Promovierendenrat/Doctoral candidates council of the Math.-Nat. Faculty. For the doctorate committee of the science faculty and AMC committees concerning our interests, we will together with representatives of other graduate schools vote for delegates.

You can contact us for ideas and suggestions regarding the GSfBS. We will collect your input and bring it to the attention of the GSfBS steering committee and/or office. Vice versa we will bring information or requests to your attention. Our common email contact is

Sarah Buchholz

Sarah Buchholz studied Biology at the University of Cologne. During her Master’s she focussed on biochemical and cellular functions of mitochondrial proteins. She moved on to neurobiology when she started her PhD in late 2018 in the lab of Hans Zempel at the Institute of Human Genetics. Her project focusses on the functional characterization of the microtubule-associate protein Tau and its brain-specific isoforms under physiological and neurodegenerative conditions.

Michael Bell

Michael Bell obtained his Bachelor’s degree in Biology at the University of Cologne, where he then completed his Master studies in Experimental and Clinical Neurosciences. In his thesis, he evaluated a neuronal cell model for studying the molecular basis of neurodegenerative tauopathies. Currently, Michael works as a PhD student in the group of Dr. Hans Zempel at the Institute of Human Genetics (University Hospital Cologne). In his project, he focusses on the mechanisms that contribute to the polarized cellular distribution of the Tau protein in human brain neurons under healthy and disease conditions.

Konstantin Weiß

Konstantin Weiß obtained his Bachelor’s degree in Biochemistry at the Goethe University Frankfurt/Main where he also completed his Master studies in Biochemistry. During his studies he spent half a year at the University of Toronto (Canada) investigating novel inhibitors for uncommon EGFR mutants in non-small cell lung cancer. His Master thesis was focussed on the recombinant expression and characterization of cyanobacterial tripartite efflux pumps. Currently, Konstantin is a PhD student in the group of Prof. Dr. Riemer (University of Cologne). In his project he investigates the regulation of DPP9 and its role in controlling dual protein localization between cytosol and mitochondrial IMS.

Moritz Haustein

Moritz Haustein obtained his Bachelor’s degree by distance learning at the Open University besides his job as technical lab assistant in cardiac research at the University Hospital Cologne. Thereafter, he completed his Master studies at the University of Cologne with a specialization in neurobiology. Moritz is currently pursuing a PhD in the research group of Prof. Ansgar Büschges at the Institute of Zoology. His research focuses on kinematic modeling of the legs of Drosophila melanogaster to provide deeper insights into the mechanisms of insect walking behavior.

Lea Hördemann

Lea Hördemann studied Biology at the University of Cologne and the Freie Universität Berlin. After completing her Master thesis on flowering time genes in wheat, she found her way back to the Botany Institute in Cologne. She is currently doing her PhD in the group of Juliette de Meaux, with a research focus on the genetic basis of interspecific differences in drought resistance in two natural Arabidopsis species.

Kim Jasmin Lapacz

Kim Jasmin Lapacz obtained her Bachelor´s degree in Biology at the University of Cologne, where she also completed her Master studies in Biological Sciences.  Currently, she pursues her PhD at the Institute of Biochemistry in the group of Prof. Dr. Jan Riemer (University of Cologne), investigating the role of adenine nucleotide kinases and their interdependence in the regulation of energy homeostasis using fluorescent sensors.